81365852 has 12 divisors (see below), whose sum is σ = 143512320. Its totient is φ = 40362336.

The previous prime is 81365833. The next prime is 81365857. The reversal of 81365852 is 25856318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81365857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79577 + ... + 80592.

It is an arithmetic number, because the mean of its divisors is an integer number (11959360).

Almost surely, 2^81365852 is an apocalyptic number.

It is an amenable number.

81365852 is a deficient number, since it is larger than the sum of its proper divisors (62146468).

81365852 is a wasteful number, since it uses less digits than its factorization.

81365852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160300 (or 160298 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 81365852 is about 9020.3022122321. The cubic root of 81365852 is about 433.3253124091.

The spelling of 81365852 in words is "eighty-one million, three hundred sixty-five thousand, eight hundred fifty-two".